Basically, this code creates an IObservable object for the TextChanged event of the TextBox.

textChanged.Throttle(TimeSpan.FromMilliseconds(delay));

This specifies that the IObservable must ignore TextChanged events raised before the specified time has elapsed.

ObserveOn(this).Subscribe(args = > handler(this.Text));

After the time has elapsed without any TextChanged event being raised, this code asynchronously notifies the observers by calling the handler (in our case, this is a void method with a string parameter).

At this point, you can use the DelayTextBoxReactive class in your form / user control as follows:

As compared to solution #1 (using a Timer), the second approach (using the Rx / Reactive Extensions library) brings quite a few advantages:

- A major advantage is the fact that memory leaks can be easily prevented, as Rx provides a more intuitive mechanism for event handling disposal (the Subscribe method returns an IDisposable reference).

- Reactive Extensions simplifies a lot of aspects of asynchronous programming, as it reduces the necessary effort for implementing a solution (for example, in my samples above, the code for the DelayTextBox implementation is significantly larger than the DelayTextBoxReactive implementation).

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